She went to comic book and science fiction conventions, dressed up as comic book characters like Spider-Man bad girl The Black Cat, The Joker's girlfriend Harley Quinn and the Justice League's Hawkgirl.
Her husband has gone out as Spider-Man, the Riddler and even built an elaborate Iron Man suit.
"Obviously, Halloween is really big for us," she laughed.
The costumes can get very elaborate. Riddell said she got noticed because her costumes were so good and because she wore them well.
"That crowd can get rough on you if you don't look good," she said.
After she moved to Charleston a few years ago and got a job in an office, she started getting approached by photographers about posing for pinup shoots.
"It was all 'Time for CD,'" she said, meaning that photographers would take her picture, but instead of paying her for her time, she got to keep a CD of the work.
"It's a way for both of us to build a portfolio," she said. "A good way for both of us to get some exposure."
Riddell appeared on a couple of websites and then was picked up for several magazines that specialize in this kind of photography, including Cupcake Quarterly, Riot Vixen and Drive-In Magazine.
It's a small and specialized market, and Riddell even has a stage name she uses for her pinup work.
"I'm Harley Heartthrob," she said.
Riddell loves the pinup genre and the age it romanticizes.
"That was when ladies wore hats and gloves and everyone dressed up, including the men. I was born in the wrong era."
Part of the appeal of vintage pinup art, she explained, is that it isn't restricted to women with "perfect" bodies. The aesthetic is a lot more open to women of practically every body type.
"You can be beautiful and be any size," she said.
And while Riddell is slender, she doesn't' starve herself.
"I'm not a size zero," she said. "I used to be, and I was miserable."
Doing pinup is still kind of a funny sideline to her, but she said she probably couldn't do it without her family, who have been very supportive.
"I've got a 19-year-old daughter and she's like, 'you go, mom.'"
Her husband is very proud.
Riddell said she wants to do more of the modeling and hopes to have her own line of calendars and posters.
"It's very flattering for me to be doing this," she said. "And it's really been a lot of fun."
Reach Bill Lynch at ly...@wvgazette.com or 304-348-5195.